Question

why does a block of plastic released under water come up to the surface of water​

Answer 1

$\huge\mathbb\fcolorbox{purple}{lavenderblush}{✰Answer}$

✧══════•❁❀❁•══════✧

The buoyant force is an upward force exerted by a fluid that opposes the weight of a partially or fully immersed object. ... Hence a plastic block floats on the surface of the water because the buoyant force exerted by water is greater than its weight which also means its density is lesser than that of water.

✧══════•❁❀❁•══════✧

$\: \: \: \: \: \: \: \: \: \: \: \: \: \boxed {\boxed{ { \blue{ \bf{ {I \:Hope \: It \: Helps \: You}}}}}}$

$\bf \underline{ \purple{Regards:}}$

$\bf\: \: \: \: \: \: \: \underline{ \underline \pink{ ItzBlìnkìngstar}}$

Answer 2

$\large{\underline{\underline{\pmb{\sf{\color{yellow}{Answer}}}}}}$

• This is due to Archimedes’ principles, which states that any object, fully or partially immersed in a fluid, is pushed up by a force equal to the weight of the fluid displaced by the object. In the case of plastic, the buoyant force is greater than the weight of the plastic object.